Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc510a637ce3a6ec…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 14:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b5f0a53445221161558988a9c76e8493 SHA-1: b9bf91acdcc41509b5c5ad646b063ed5668cad5c SHA-256: cc510a637ce3a6ec4400db20ebd8d65ab0eac11db8553c99c4fbd570545f6037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://studiorestagno.eu/userfiles/files/jugusozusokokanulijozixe.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fd13f1b8c---33537463079.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/buvasedumupuporebusokegi.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/39869749893.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533d621a17c---93403246304.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/pofipufuninipifozixo.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/59605578475.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613585e867a10---42960074243.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13f1d1ddc---dojoponenebaj.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/58514984224.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/sefadafukinukujosufixir.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/jazivutopimire.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/25128553239.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2b9559ad957680691fa9820c00e80417/94024294476.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/janisodeledi.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/53062525327.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/pevekodomuwekadipito.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91388684813.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56065180039.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/30365105694.pdfIn PDF document text
    • http://dsagco.com/Upload/file/56339413371.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/30264494719.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/fivuvexazupirifu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/43785494111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sarkar+3+watch+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 10688 bytes
SHA-256: 4cd11ed6da91dfe39f1a5e2047185c11800c56335fa073204fad1d37b076f9bd
font_02_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 17512 bytes
SHA-256: 773d6bac2a121135224bda39b6528b7807350c9aed3c571ec8b1062c293339a8

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